<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card class="box-card">
      <!-- 头部的警告区域 -->
      <el-alert title="注意：只允许为第三级商品分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cate_optoin">
        <el-col>
          <div>选择商品分类</div>
          <!-- 选择商品分类的级联选择器 -->
          <el-cascader
            clearable
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            style="width: 400px;margin-top:15px"
            @change="parentCateChanged">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab标签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!--添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand" width="100" align="center" label="查看参数">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable
                @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框与tag之间切换 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="序号" align="center" width="100"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name" align="center"></el-table-column>
            <el-table-column label="操作" align="center">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!-- 静态属性的表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand" width="100" align="center" label="查看参数">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable
                @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框与tag之间切换 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="序号" align="center" width="100"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name" align="center"></el-table-column>
            <el-table-column label="操作" align="center">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+dialogTitleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
      >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="dialogTitleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'编辑'+dialogTitleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
      >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="dialogTitleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  computed: { // 计算属性
    // 如果按钮需要被禁用 返回true
    isBtnDisabled() { // 判断是否选中三级分类
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id值
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 添加动态参数/静态属性的对话框共用一个对话框
    // 动态计算标题
    dialogTitleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
  data() {
    return {
      // 所有商品分类的数组
      catelist: [],
      // 级联选择器的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 级联选择器双向绑定的数据
      selectedCateKeys: [],
      // 被激活的标签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制编辑对话框的显示与隐藏
      addDialogVisible: false,
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 控制tag与input文本框的显示切换
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: '',
      // 添加参数的表单数据对象
      addForm: {
      },
      // 编辑参数的表单数据对象
      editForm: {
      },
      // 添加参数的表单验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 编辑参数的表单验证规则对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      }

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // tab标签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsdata()
    },
    // 展开列文本框失去焦点或按下enter键的触发函数
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 用户输入了内容 需要后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrValues(row)
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrValues(row) {
      // 发起请求 保存添加参数可选值的操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      console.log(res.meta.status)
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    // 点击按钮 展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法 当页面上元素被重新渲染后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 获取参数的列表数据
    async getParamsdata() {
      if (this.selectedCateKeys.length !== 3) { // 选中的不是三级分类
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中三级分类
      // 根据所选择分类的id和当前所处的面板 发起请求
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      // 判断获取到的是动态参数many还是静态属性only 赋值给不同的变量
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 级联选择器选中项发生变化时的触发函数
    parentCateChanged() {
      this.getParamsdata()
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 监听编辑对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击确定按钮 请求接口 添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请输入')
        else {
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsdata()
        }
      })
    },
    // 点击编辑按钮展示编辑参数的对话框
    async showEditDialog(attrid) {
      this.editDialogVisible = true
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`,
        {
          params: {
            attr_sel: this.activeName
          }
        })
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
    },
    // 点击确定按钮提交修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {

        } else {
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_name: this.editForm.attr_name, attr_sel: this.activeName
          })
          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败')
          }
          this.$message.success('修改参数成功')
          this.getParamsdata()
          this.editDialogVisible = false
        }
      })
    },

    // 根据id删除对应的参数
    async removeParams(attrid) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除
      // console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 点击确定 进行删除
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
      // console.log(res.meta.status)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsdata()
    },

    // 根据id删除参数的可选项
    async handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValues(row)
    }
  }
}
</script>
<style lang="less" scoped>
.cate_optoin{
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 100px;
  margin: 10px;
}
.button-new-tag{
  margin: 10px;
}
</style>
